Thx for the tip to add vinegar to egg shells to keep pH down. I have used egg shells in the past and ended up with a high pH.
I use gypsum as a calcium and sulfur amendment like some others mentioned. Whenever I do a project on the house involving drywall I will break the scrap drywall into smaller chunks and then pulverize it. I've found that it pulverizes really easily if you soak it first.
I only do this with drywall scraps after a job is done to keep the scraps out of a landfill. Agricultural gypsum is probably cheaper than drywall, but scraps are just trash.
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